A system of human anatomy, general and special . three sur-faces—anterior, posterior, and basilar; and three borders—superior,anterior, and posterior. Surfaces.—The anterior surface, forming the posterior boundaryof the middle fossa of the interior of the base of the skull, presents forexamination, from base to apex, first an eminence caused by the pro-jection of the perpendicular semicircular canal; next, a groove leadingto an irregular oblique opening, thehiatus Fallopii, for the transmis-sion of the petrosal branch of theVidian nerve; thirdly, another andsmaller oblique foramen, immediately
A system of human anatomy, general and special . three sur-faces—anterior, posterior, and basilar; and three borders—superior,anterior, and posterior. Surfaces.—The anterior surface, forming the posterior boundaryof the middle fossa of the interior of the base of the skull, presents forexamination, from base to apex, first an eminence caused by the pro-jection of the perpendicular semicircular canal; next, a groove leadingto an irregular oblique opening, thehiatus Fallopii, for the transmis-sion of the petrosal branch of theVidian nerve; thirdly, another andsmaller oblique foramen, immediatelybeneath the preceding, for the pas-sage of the nervus petrosus superfici-alis minor, a branch of Jacobsonsnerve; and lastly, a large foramennear the apex of the bone, the termi-nation of the carotid canal. The posterior surface forms thefront boundary of the posterior fossaof the base of the skull; near its mid-dle is the oblique entrance of the me- * The left temporal bone, seen from within. 1. The squamous portion. 2. The mas- Fig. 31.*. 70 TEMPORAL BONE. atus auditorius internus. Above the meatus auditorius interims isa small oblique fissure, and a minute foramen; the former lodges aprocess of the dura mater, and the foramen gives passage to a smallvein. Further outwards, towards the mastoid portion of the bone,is a small slit, almost hidden by a thin plate of bone; this is theaquceductus vestibuli, and transmits a small artery and vein of thevestibule and a process of dura mater. Below the meatus, and partlyconcealed by the margin of the posterior border of the bone, is theaquceductus cochlea, through which passes a vein from the cochlea tothe internal jugular vein, and a process of dura mater. The meatus auditorius internus is about one-third of an inch indepth, and pursues a slightly oblique course in relation to the petrousportion of the temporal bone, but a course directly outwards in rela-tion to the cranium. At the bottom of the meatus, and upon its ante-rior as
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Keywords: ., bookcentury1800, bookdecade1840, booksubjectanatomy, bookyear1847
